Pbimaby cell



(No Model.)

LKITSBE:

D PRIMARY GELL. No. 584,474. Patented June 15,1897.

we 675 d z 1 3 Inventog.

ful Improvements in Primary if! P rt T'Rmft Lat Ju .w.

Isinon Kl'lSI-llfi, '72.? "HILADELPHIA, PENNSYLVANIA, AssicNon To ntnornro oonrnnr, on SAME LACE.

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e n i or n v m on lm part oi Letters .lPetent no. 584., l74, dated June 15, 1897. Application fil d September 15, 1896. Serial No. 605,903. (lilo nioclel.) l l Q To aZZ whom it may con ern: Be it kncwn that ll, ls

city and coun ty of l lilndelphi sylvsnia, have invented co ,Eil'ste of Pennanew and 1 Cells. 1 the following is specification.

My invention relates primary cells, and more speciclly to such the one-fluid type.

The invcu tion has more specially reference, first, to the mode or method of making or pro paring the positive or zinc element, and, sec 0nd, to the mode or paring the negative or depclnrizing element,

In primary cells the selection of the electrolyte is of great importance for the reason that the resistance of the different liquids greatly very. Sulfuric therefore, new ing the lowest resistenc would he preferred but for the reason thdt cells, has too great n-neinnity L01 the acid and dissolves even if the cir Different methods have been employed to overcome this difiicnlty, but l'hcve found that the one hereinafter described has the great advantage of simplicity, compactness, and durability over the others known or described. As to the negative or depolarizing element, 1 have found that 821 salt of. lead brought to it high state of oxidation W611 ndupted for its purpose, but economy lntrs out the employment in primary cells of oxidized load. not only for the reason that the clinrgin g, if done c1ectricnlly,of ecchelerncnt separate requires an unnecessary amount of lchor and horn dling, but also for the reason that Where OXl: dized lead is exposed to tl'iceotion of sulfuric acid after being partially discharged e s'loii' sulfnting tckcsplccc, resulting in the despoih ing of the element In my; experiments r ent points batteries o rent constructions, having more or loss of bllfi oxidised lend err.

posed to the electrolyte, and sinvcria hlyc locall notion between the izing element tool: p charge, if the battery i lose end the depolarnft'er pnrtinl dis- .ldlevtor about one elem therefore, which pert of ltscondoctor to the electrolyte cnnnot be'el'fectnally used in primary cells employedlor-og ecn cic method of making or 1 c, which isnsunllv employed ns'the dissolving agent in such cuit is not closed.

cult Work. It is therefore necessary tos'urround the conductor proper; entirelywith1a;v

LQ i f insssend it very. compact mass at that, of the;

high oxid; but rcpeatedd-cxperimerits; have provcn that it is hardly possible .to:comprssa solid mass of low .oxid around a conductor and electrically charge the so compccted mass- I to the point of highest oxidation Without breaking or cracking the mass inthe process of for natio11.. In my experiments Ihavcrcpectcdly manufactured such elements with the greatest possible care, using a very slight current at the beginning and discharging so thatnecrlyi every third day of the charge,

one month was consumed in bringing one seti of'such elements to the required standard, and. yet it was not possible to obtain perfect success. Cracking and breaking upcouldnot loo entirely obviated. For. this andlot-honp tent reasons I have recourse to the method'aslater on to he described.

Referring to the drawings, in

which similcri lettcrsindicalte similar. parts, Figurol isc vertical section.

Fig. 2 is a section; on line cow of Fig. 1.

A is the containing vessehipifcfcmbly of i lindriccl form, so as to be enabled to have the, j cap screwed to the top of the 3' a1, thereby making an air-tight joint,- which isof advantage to prevent a great deal of evaporation and creeping of salt.

B is the cap or cover, both being threaded, as shown eta. l

D is the tirety, of Which D tor in the shcpeof a rod, preferably ,ofcop.- per; F, the element proper, consisting of an positive or zincelclnent asan cnis the supporting-couduoamalgam of zinc and mercury or lead. and...

mercury, as the case may be; F, the cupconr.

teining the compound F other protuberance preventing the rod D" from slipping through the orifice of l the cup F; document surrounding the lower part of said cup.

The modus opcm ndi of prepalring thc-elevment is the following: A cup,

;1,F a rivet-head or preferably in the shape of around vessel, one inch in dimuster" by two inches high, is provided at its bottom With an orifice large enough for the conducting-rod to pass through. The lower end ot the rod is flattened or provided with off the cup. The compound in a molten state a Washer, so that when placed in position, as

shown in Fig. 1,-it is prevented from slipping small proportion of wax.

I am aware'that as, forinstance, in the socall-ed fuller or like cells--the positive or zinc element is placed in connection with free so mercury in a receptacle, but. such is not my intention. such description do not work well and are not easily transportable, I had recourse to the method as above described, in which the whole mass is as an entirety poured in its molten stateinto its cup,filling the same entirely with one solid mass, no free mercury being present.. In following out this method or process the sole and only object is to practically make out of the three parts-the conductor, the metal, and the cup-one mechanical unit, which unit I am aware may also be established by first casting the metal an d then providing the metal with a tight-fitting cup; but I have found in my experiments that such requires great care and that even the slightest space between metal and cup is a disadvantage, and I therefore prefer the process of casting the metal into the cup.

D is thenegative or depolarizing element as an entirety. D is the conductor proper. E is the depolarizing compound, and E the nonconducting envelop surrounding the compound. The conductor D is atits lower end provided with the enlargement d Said enlargement is preferably provided so as to give ,oxid, is in bulk brought to the highest state of oxidation, preferably through the action of the electric current. The high oxid is then powdered and in suitable molds, provided I, with conductingrods, compacted around said rods under high pressure. It is preferred to make theconductingnod about three-eighths of an inch and the surrounding massabout five-eighths of an inch in diameter. As said above, it is of great importance that no part of the conductor shall bein direct contact with the electrolyte, and. therefore the. depolarizing mass should surround the conductor entirely so far as said conductor is designed to be immersed in the electrolyte.

Having found that elements of In my experiments I was a great deal annoyed by the fact that the compressed depo-. larizing compound commenced to drop off as soon as the outside circuit was closed, which very often resulted in the entire disintegration of the whole element. A low oxid, such as red lead or a sulfate of chlorid of other material, maybe added to the depolarizing compound in the process of compression as a binding m erial; but all such means only lessen the t ,ctric properties of the compound proper, establish local action, and reduce the high oxid to a low oxid.

After experimenting with different material l have found a simple solution of the question in the dipping of the element in a plastic mixture of plaster of-paris and water, thereby providing the whole with an outer and thin envelop of plaster-of-paris or gypsum, and repeated experiments have convinced. me that such envelop is a necessity if the negative element consists of a conductor having compressed thereon a high oxid of lead brought to its high state of oxidation with the aid of the electric current independent of its conductor. It should be clearly understood that the outer envelop does not add directly to the efficiency of the negative element, but only indirectly in so far as it fulfils the oiiice of a non-conducting material, keeping mechanically the different parts out of which the negative element consists together. Ihis outer envelop is also beneficial for the reason that the depolarizing compound, being of an unstable nature, if accidentally coming in contact with some salts of other materials, such as a chlorid of ammonia or othcr'chlorids or bromids or nitrates, may lose a great part of its oxygen and therefore usefulness.

Both of the elements are preferably secured to the cover or cap in the following manner: The upper part of the rods are screwthreaded. A nut is placed on the lower end of. the thread and'the upper part of the rod carried through the hole with which the cover is provided. The rod .is secured to the cover with the aid of a second nut and washer, so as to provide effectually against any leakage or creeping of salt. It is well understood that wires for the outside circuit can be secured, either with or without the aid of additional nuts, to the upper parts of the rods. I have found it advantageous to cover the first-mentioned nut and, in fact, the whole inner part of the top of the cover with cement.

In the drawings the nuts of the positive element are designated by the letter (Z. (Z is a washer which is interposed between the upper nut and the cover I b is the screwthreaded portion of the red I). The nuts of the negative element are designated by the letter d, and (Z is a washer interposed between the upper nut and the cover B. 7. is the screw-threaded portion of the rod D The negative element may also be provided with the rubber rings e.

As an electrolyte I use diluted sulfuric acid, and such an electrolyte is'designated in the drawings by C.

It is unnecessary for me to point out more particularly the material of the vessel A and the cap or cover B. Both may be of glass, hard rubber, porcelain, or any other composition capable of fulfilling the oflice of a containingjar and cover, but both should be of non-conducting material. The cup F, I have made of copper, brass, wood, and porcelain, and the selection of such material lies within the scopeof the person manufacturing such cell.

Having now described my inven tion, what I claim as new, and desire to secure by Letters Patent, is-

1. A positive element consisting of a containing-cup of a material designed to remain inert, a conducting-rod passing through the cup and a solid body of an alloy of mercury and a metal, as zinc, cast so as to fill the space between said cup and red, the surface of said solid body only being exposed.

2. In a positive element a containing-cup provided with a perforation at the bottom through which a metallic rod designed to act as a conductor passes, and an alloy cast so as to fill the space between said rod and cup the lower part or bottom of said containingcup being covered with a cement.

3. The method'oi' preparing a-negative element for primary cells which consists in: first, bringing a low oxid of lead to a higher stats of oxidation through the. action of an 14th day of September, 1896,

electric current, in, secondly, compressing the powdered high oxid 'of lead around a metallic rod, embedding the same effectually in said compound, and thirdly, providing the whole with an outer layer of plaster-of-paris. p

4. An improved primary cell consisting of a vessel containing dilute sulfuric acid as an electrolyte, a positive element consisting of a containing-cup, a conducting-rod, a solid body of an alloy of zinc and mercury cast between said cup and rod, and a negative element having compressed thereon a high oxid of lead, both the positive as well as negative element being suspended from the cap or cover of the containing vessel.

5. An improved primary cell consisting of a vessel containing dilute sulfuric acid as an electrolyte, a positive element and a n'egative element said negative elementconsisting of a conducting-rod having compressed thereon a high oxid of lead held together'by an outside layer of plaster-of-paris.

6. A negative element for primary cellsconsisting of a metallic rod surrounded as to all'its parts designed to be immersed in the 6 electrolyte, with-a high oxid of lead, said high oxid of lead being surrounded or enveloped by plaster-of-paris.

In testimony whereof I sign my name, this of two subscribing Witnesses.

, ISIDOR KITSEE.

Witnesses:

W. B. ELDRIDGE,

GEO. M. COSTELLO.

in the presence 

